Ready Mixed Screed Calculator (UK & USA)
This calculator helps you estimate the volume and weight of ready-mixed screed needed for your flooring projects. Whether you're prepping a domestic subfloor in Derby or a warehouse slab in Dallas, this tool is tailored for accuracy.
Technical Guidance
- 🇬🇧 UK: Traditional sand/cement screed mix ratio is 1:3 to 1:4.5.
- 🇺🇸 USA: Follow ACI 302 standards for topping slabs and floor screeds.
- Recommended depth: 50–75mm for standard internal floors.
Mix Types
| Type |
Ratio |
Notes |
| Traditional Screed | 1:4 | Standard for domestic floors |
| Flowing Screed | Factory-mixed | Ideal for underfloor heating |
| Modified Screed | 1:4 + fibres | Improves strength and bonding |
Density Reference
| Material |
Density (kg/m³) |
Density (lb/ft³) |
| Ready-Mixed Screed | 2100 | 131 |
Pro Tips
- Account for 10% extra material to cover waste and spillage.
- Plan delivery logistics in advance—screed has a limited workable time.
- Ensure the substrate is clean and primed for screed application.
Common Mistakes
- Underestimating screed volume due to uneven subfloor.
- Pouring in cold or hot conditions without proper curing plans.
- Skipping reinforcement when necessary (especially on larger spans).
FAQs
- How much screed do I need for 20m² at 50mm?
Approximately 1m³ or 2.1 tonnes.
- Can I walk on the screed the next day?
Usually 24–48 hours for light foot traffic; check with supplier.
- What’s best for underfloor heating?
Flowing screeds like anhydrite are preferred due to better coverage.
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